/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;


namespace Composite.Core.Extensions
{
    internal static class DictionaryExtensionMethods
    {
        public static TValue GetOrAdd<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key, Func<TValue> createValue)
        {
            if (dictionary is ConcurrentDictionary<TKey, TValue>)
            {
                var concurrentDictionary = dictionary as ConcurrentDictionary<TKey, TValue>;
                return concurrentDictionary.GetOrAdd(key, k => createValue());
            }

            TValue value;
            if (dictionary.TryGetValue(key, out value))
            {
                return value;
            }

            lock (dictionary)
            {
                if (dictionary.TryGetValue(key, out value))
                {
                    return value;
                }

                value = createValue();
                dictionary.Add(key, value);
            }

            return value;
        }

        public static List<KeyValuePair<string, TValue>> SortByKeys<TValue>(this Dictionary<string, TValue> dictionary)
        {
            var result = dictionary.ToList();

            result.Sort((a, b) => string.CompareOrdinal(a.Key, b.Key));

            return result;
        }
    }
}
